Chusetts



(No Model.) 2 Sheets-Sheet 1.

A. M. OOMEY & H. G. PARKER.

RECORDING THERMOMETER.

No. 582,043. Patented May 4, 1897.

(N0 Mcdel.) 2 Sheets-Sheet 2.

A. M. COMEY & H. G. PARKER.

REOORDINGTHBRMOMBTER.

No. 582,043. Patented May 4,1897.

Fig.8.

.2? WI' gasses WMZZW N'- UNITED STATES PATENT @EFicE.

ARTHUR M. COMEY AND HARRY PARKER, OF CAMBRIDGE, MASSA- CHUSETTS.

RECORDlNG-THERMOEVIETER.

SPECIFICATION forming part of Letters Patent N 0. 582,043, dated May4,1897.

Application filed June 25, 1896. Serial No. 596,852. (No model.)

To aZZ whom it may concern.-

Be it known that we, ARTHUR M. Connr and HARRY G. PARKER,citizens of theUnited States, and residents of Cambridge, in the county of Middlesexand State of Massachusetts, have invented new and useful Improvements inRecording-Thermometers, of which the following, taken in connection withthe accompanying drawings, is a specification.

This invention relates to improvements in recording-thermometers for thepurpose of automatically recording variations in temperature upon agraduated indicator-card attached to a drum rotated-by any suitableclock mechanism, preferably arranged within said drum. The card upon thedrum is divided by vertical lines corresponding to hours and divisionsthereof, and is also divided by horizontal lines corresponding todegrees of temperature. In connection with such device is used asuitable stylus or marker adapted to transfer a record uponthelrevolving graduated indicator-card. The said stylus is attached to arod or wire provided at its lower end with a head or float-pistonresting directly upon the mercury in the open end of a thermometer tubeor fountain containing mercury, as will hereinafter be more fully shownand described, reference being had to the accoinpanying drawings,wherein Figure 1 represents a front elevation of our improvedrecording-thermometer. Fig. 2 rep resents a central vertical section ofthe same. Fig. 3 represents a detail front elevation of the rotary drumand recording mechanism. Fig. 4 represents a detail longitudinal sectionof the open upper end of the mercury-tube and piston or head resting onthe mercury therein, and Fig. 5 represents a detail top plan view of thecard-carrying drum and stylus or marker.

Similar letters refer to similar parts wherever they occur on thedifferent parts of the drawings.

A represents a suitable frame for the instrument, below which is locateda thermometer tube or fountain 13, containing mercury O. Said tube isclosed at one end I) and has at its other end a Vertical portion 15,open to the atmosphere, as shown in Fig.

Directly upon the mercury O in the tube 13 rests a head or floatpistonD, to which is attached an upwardly-projecting stem d, the upper end ofwhich carries a stylus, pen, or marker E, adapted to be held by ayielding pressure against a graduated card F, surrounding the rotarydrum G, as shown.

In practice the stylus E is adjustably se cured to a suitable springclasp or holder 6, guided on vertical wires it, attached to standards II and frame A, as shown in Figs. 1, 2, and 3.

Preferably within the upper portion of the drum G is secured a suitableclock mechanism K, 011 which 7; is the rotary spindle, which may bearranged to rotate, preferably, one revolution in twenty-four hours, ormore or less, as may be desired. The spindle 7a is preferablyfrictionally held in the upper end of a tube L, projecting looselythrough the bottom of the drum G and provided with a disk Z, resting ona stationary plate M, secured to the frame of the apparatus.

The lower end of the tube L is guided on a stationary spindle N, whichlat-ter projects upwardly into the said tube L, as shown in Fig. 2.

During the rotation of the clock mechanism its spindle 7c is heldattached to the upper end of the tube L and the latter is held fromrotation by the frictional resistance between the disk Z and support M,occasioned by the weight of the drum G and the clock work K, as shown inFig. 2.

If it is desired to adjust the position of the drum G relative to thestylus or marker E, this may readily be done simply by raising the saiddrum and the disk Z free off the support M, when the drum may be turnedaround its axis more or less, so as to cause the stylus or marker topoint to any desired portion of the graduated card F, according to thetime for commencing the recording of the temperature in the place wherethe instrument is located.

It will be noticed that in this our device "the mercury-containing tubeis open at one end to the atmosphere and the stylus-carry ing spindle isprovided with a head or iioat resting directly upon the mercury in saidthermometer, thus making the instrument very sensitive and responsive tovariations in the temperature of the atmosphere.

The operation is as follows: A graduated indicator-card F is attached ina suitable manner to the outside of the drum G and the stylus or markerE is adjusted for contact. The clockwork K causes the said card-carryingdrum slowly to rotate, preferably, once in twenty-four hours, duringwhich time the stylus is automatically caused to rise and fall inaccordance with the expansion or contraction of the mercury in the tubeB, on which such stylus is supported, thus producing the desired recordon the card.

Having thus fully described the nature,construction, and operation ofour invention, we wish to secure by Letters Patent, and claim- In arecording-thermometer, the combination witha thermometer B open at oneend,

of a piston D floating on the surface of the mercury and provided withan upwardly-projecting stem d, a stylus carried by said stem, a rotarydrum G carrying a graduated indicator-card, a clock mechanism K forrotating said drum, a vertical tube L on which the drum is supported, adiskZ fixed on the lower end of said tube and a fixed disk M on whichthe disk Z rests, substantially as described and for the purposespecified.

